Fig. 1. Microstructure of SiCp/AA2024 composite base material

Fig. 2. (a) Schematic diagram of experimental setup; (b) schematic diagram of laser ablation path

Fig. 3. Morphology of ablated surface. (a) SEM; (b) 3D confocal laser scanning microscopy; (c) SEM of cross-section; (d) re-solidification on the surface with a high magnification

Fig. 4. Variations of laser ablation results with pulse width. (a) Ablation depth and re-solidified layer thickness; (b) surface roughness

Fig. 5. Re-solidified layer of ablated surface. (a) SEM; EDS (b) surface and (c) point scanning analyses of chemical element distribution

Fig. 6. Ablation results by 28 J/cm2 laser under different gas pressures. (a) 0.1 MPa; (b) 1 MPa

Fig. 7. Schematic diagrams of nanosecond-pulsed laser ablation of materials under different gas pressures. (a) 0.1 MPa; (b) 1 MPa